CHAPTER 13 - PowerPoint PPT Presentation

CHAPTER 13. MEIOSIS AND SEXUAL LIFE CYCLES. I. OVERVIEW. Living organisms are distinguished by their ability to reproduce their own kind Genetics is the scientific study of heredity and variation Heredity is the transmission of traits from one generation to the next via genes (DNA)

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Meiosis, sexual reproduction, and heredity are all aspects of the same process.

Meiosis is a modified type of cell division in sexually reproducing organism consisting of two rounds of cell division but only one round of DNA replication. It results in cells with half the number of chromosome sets as the original cell.

3. In sexual reproduction, two parents give rise to offspring that have unique combinations of genes inherited from the two parents. Offspring of sexual reproduction vary genetically to their siblings and both parents.

Involves the formation of gametes

Asexual Reproduction sperm and egg which carry each parent’s genes which are combined at fertilization

In some species, the nuclear envelope and nucleoli reappear, and the daughter cells enter a period of interkinesis before Meiosis II. In other species, the daughter cells immediately prepare for Meiosis II.